diagnostics Article Local Laboratory Testing of Germline BRCA Mutations vs. Myriad: A Single-Institution Experience in Korea Joohyun Hong 1 , Jiyun Lee 1, Minsuk Kwon 1, Ji-Yeon Kim 1, Jong-Won Kim 2 , Jin Seok Ahn 1, Young-Hyuck Im 1 and Yeon Hee Park 1,* 1 Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea;
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[email protected]; Tel.: +82-2-3410-1780 Abstract: Genetic diagnosis for human epidermal growth factor receptor 2-negative metastatic breast cancer patients with the germline BRCA (gBRCA) mutation has been emphasized since the development of polyadenosine diphosphate-ribose polymerase inhibitors. Myriad Genetics, Inc.’s (Salt Lake City, UT, USA) companion diagnostics service is almost exclusively used for genetic testing. The aim of this study was to compare the results of germline BRCA mutation tests returned by a local laboratory and those performed by Myriad. Between April 2014 and February 2018, 31 patients with gBRCA 1/2 mutation test results from both Samsung Medical Center (Seoul, Korea) and Myriad were enrolled. “Discordant: Opposite classification” was observed for only one among 27 (3.7%). Citation: Hong, J.; Lee, J.; Kwon, M.; This discrepancy was due to the detection of a deleterious large genomic rearrangement of BRCA 1 Kim, J.-Y.; Kim, J.-W.; Ahn, J.S.; Im, by Myriad.